Toshiba LF620F 用户手册

 

 

 

The electromagnetic flowmeter uses Faraday’s Law of 

electromagnetic induction to measure the process flow. 

The device consists of two units: a detector, through 

which the fluid to be measured flows and in which 

low-level signals proportional to flow rates are 

obtained; and a converter, which supplies excitation 

current to the detector, and amplifies the signals from 

the detector and then processes and converts the signals 

into the 4–20 mAdc current signal or communication 

signal. The meter features a Mount-Anywhere 

magnetic field distribution technology, the meter is 

highly immune to upstream flow disturbances. 

Combined with a multi-functional converter LF620 

(combined type) or LF622 (separate type) equipped 

with its patented Noise-Sentry original noise- 

suppression circuit and advanced algorithms. The 

LF654 has a very high tolerance to noise, giving the unit 

a very stable output even for slurry fluid measurement. 

IR (Infrared) switches enable parameter setting of the 

converter without removing the cover. Flow direction 

can be set in either way, and its unique 128 x 128 dot 

matrix LCD display allows the LCD to be rotated 

electronically to 90, 180 and 270 degrees without 

opening the cover. 

 

*   HART protocol (Highway Addressable Remote Transducer) is 

a communication protocol for industrial sensors recommended 
by the HCF (HART Communication Foundation). 

**  DevComm2000 Smart Device Communicator available 

through TIC for performing HART device configurations on 
PC or laptop . 

*  PROFIBUS is the communications protocol for factory and 

process automation that the PROFIBUS Organization 
recommends. Instead of analog control with a conventional 
analog signal (4-20 mA), it is fieldbus which digitizes all 
signals. Flowmeters support PROFIBUS-PA.  

*  Modbus is the communication protocol that Modicon Inc. 

developed.  Physical layer is RS485. 

  Combined type   

 

 

 

 

 

 

 

LF654/LF620F                    LF654                     LF622F 

 

               

 

  

 

0 –1.0 ft/s to 0 – 39.4ft/s (0 – 0.3 m/s to 0 –12 m/s). 

0 – 0.3 ft/s to 0 – 1.0 ft/s (0 – 0.1 m/s to 0 – 0.3 m/s) 

range is available optionally. 
Accuracy:  
< 1/2" to 18" ( 15mm to 450mm) > 

±0.2 % of Rate

* 

*  This pulse output error result is established under standard 

operating conditions at Toshiba admitted flow calibration 
facility.  (NIST Traceable)  

*  Individual meter measurement error may vary up to ±0.5% of 

Rate at 1.64 ft/s (0.5m/s) or more and ±0.3% of rate ±0.039 
inch/s (1mm/s) at 1.64 ft/s or less. 

*  Current output: plus ± 8µA (0.05% of span.) 
*  Refer to individual calibration data for each individual meter's 

measurement error.

Certification 
No.  Z01207 

For PU and  

HR lined flowmeter